ספר חידושי הר"ן / מרבינו ... נסים ב"ר ראובן ...

Nissim ben Reuven (1320–9th of Shevat, 1376, Hebrew: נסים בן ראובן) of Girona, Catalonia was an influential talmudist and authority on Jewish law. He was one of the last of the great Spanish medieval talmudic scholars. He is also known as the RaN (ר"ן), the Hebrew acronym of his name, as well as the RaNbaR (רנב"ר), the Hebrew acronym of his full name, including his father's name, Reuven (ראובן).

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